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TL494CN

Voltage-mode PWM controller, dual error amps, 300kHz, push-pull/single-ended, 16-PDIP

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Pieza del fabricante：

TL494CN

Paquete：

16-PDIP

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Descripción

Productos

The TL494CN from Texas Instruments is a fixed-frequency pulse-width-modulation (PWM) control circuit for switching power supplies. With dual error amplifiers, adjustable dead-time, and push-pull or single-ended output, it is the standard controller for PC power supplies and ATX PSU designs. Packaged in 16-PDIP.

Especificaciones

Control Mode Voltage-mode PWM
Switching Frequency 1Hz to 300kHz
Tensión de alimentación 7V to 40V
Reference Voltage 5V +/-5%
Error Amplifiers 2 (independent)
Corriente de salida 200mA per output
Output Config Push-pull or single-ended
Dead Time Control 0 to 45% adjustable
Paquete 16-PDIP
Temperatura de funcionamiento 0 to +70 C

Características

  • Dual error amplifiers for voltage and current feedback
  • Adjustable dead-time control (0-45%)
  • Push-pull or single-ended output configuration
  • Internal 5V reference (5%)
  • Output transistor can source or sink 200mA
  • Under-voltage lockout

Aplicaciones

  • ATX and PC power supply controllers
  • Half-bridge and push-pull converters
  • DC-DC converter regulation
  • Battery charger control circuits

The TL494CN from Texas Instruments is the industry-standard voltage-mode PWM controller used in millions of PC power supplies worldwide. It contains all the building blocks for a switching power supply: an oscillator with frequency set by RT and CT, two error amplifiers for voltage and current feedback, an adjustable dead-time control comparator, a pulse-steering flip-flop for push-pull operation, and two totem-pole output transistors rated at 200mA each. The output configuration pin (pin 13) selects between push-pull (two alternating outputs) and single-ended (parallel outputs). The dead-time control pin (pin 4) provides 0-45% dead-time adjustment, essential for push-pull and half-bridge converters to prevent shoot-through. The internal 5V reference powers the error amplifiers and can supply external circuits. The TL494 has been the backbone of ATX power supply design since the 1990s.

The TL494 oscillator generates a sawtooth waveform at the CT pin with frequency determined by RT and CT values (f = 1/(RT x CT)). This sawtooth is compared against three signals in the PWM comparator: the dead-time control voltage (pin 4), the output of error amplifier 1, and the output of error amplifier 2. The PWM comparator outputs a pulse whose width is determined by the lowest of these three control signals. In push-pull mode, the pulse-steering flip-flop alternates the output between the two output transistors (Q1 and Q2) on each oscillator cycle, producing a 50% maximum duty cycle per output. In single-ended mode, both outputs switch in parallel for up to 100% duty cycle. The dead-time control adds a minimum off-time that prevents both output transistors from being on simultaneously in push-pull configurations, ensuring safe operation of the external power switches.

Pin Nombre Función
1 1IN+ Error amp 1 non-inverting input
2 1IN- Error amp 1 inverting input
3 FEEDBACK Feedback / PWM compensation
4 DTC Dead-time control (0-45% dead time)
5 CT Oscillator timing capacitor
6 RT Oscillator timing resistor
7 GND Suelo
8 C1 Output transistor 1 collector
9 E1 Output transistor 1 emitter
10 E2 Output transistor 2 emitter
11 C2 Output transistor 2 collector
12 VCC Supply voltage (7-40V)
13 OUT CTRL Output control (GND=push-pull, REF=single-ended)
14 REF 5V reference output
15 2IN- Error amp 2 inverting input
16 2IN+ Error amp 2 non-inverting input
  • ATX PC power supply controller with dual error amplifiers for voltage and current regulation
  • Half-bridge and push-pull converter control with adjustable dead-time
  • DC-DC converter regulation with voltage-mode PWM and 200mA output drive
  • Battery charger control circuits using dual error amplifiers for CV/CC regulation
Modelo Fabricante Diferencia clave
UC3842BN TI Current-mode, single output, higher performance
KA7500B Fairchild TL494 equivalent, second source
SG3525A ST Push-pull PWM, totem-pole outputs
LM5025 TI Active clamp forward controller, modern
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